Beware of NAD M3 Fire Hazard

"The only likely cause for a power filter cap blowing like that is a power surge issue or a mechanical short. The only incident like that I have experienced in decades of commercial installations was when high voltage showed up between neutral and ground on an AC outlet. "

The power surge taking out the diode bridge and allowing AC into the capacitor..

Interesting...I owned a repair shop for 20 years or so way back, when 8086 8088 processors were everywhere.  There was a  3 phase transformer above the one that feed the shop. Everyone around the shop with PC, would loose power supplies, TVs up in smoke, Everything except the store. I had Topaz line conditioners in the shop..I mean top of the line at the time, FREE. got them out of a hospital closure.

They (across the street) had a thing called a Delta stinger, a Large welding / fab shop. One leg was 208-220, I think.  The other two were 110, 220 between the two 110-117 . It was so they (not me) had 480 for their welding shop.They had a transformer in the facility also. 
I'm kinda close on the description. That big transformer shared a common leg, up on the pole I don't recall just how. BUT at night I saw a little light show between the two. I called PGE. they ran a tape on both sides of the Topaz units. Before unit and after. 135-165 VAC spikes whenever they were welding with certain rigs, across the street.  The Topaz units worked perfect. No brownouts no, Overages.  PG&E paid for anyone that had complained. Something to do with that delta stinger setup, the PG&E guys said.. At my house back then, hovered at 105 then spike at night. All fixed now, but dirty AC all kinds of problems, ay..

Regards

pwb -- To me it seems obvious they are shining you on. You now have my permission to be like your blown cap and flame the hell out of the company.

The previous versions of my NAD C272 also had exploding caps (currently not in use but has worked well).  Turned out to be cheaply sourced capacitors.  Possibly they did not learn from that mistake.  

Yeah, but that pic man, it shows sprayed cap juice everywhere.

Yeah, its a mess. I've cleaned that sort of nastiness up before. If this were my unit I would be fixing it; replacement is going to be a lot more and unrepaired its worthless. But I understand being gun-shy too.

Well I tried. Here’s nad’s response:

Unfortunately, as this amp appears to have been bought second hand through a non-authorised reseller, we cannot verify its past history or conclude what alterations or repairs may have been made to the amp before you received it -- all NAD product sold from authorized retailers are given a full Quality Check before resale which is necessary, whereas when bought elsewhere we cannot guarantee this. We have not heard any other reports of this sort of event happening with the M3.

I'm apologise that I am unable to help further, but please let me know if you have any further questions.

Kind regards,
Sam R.,
Support Crew Analyst